A woman is fighting for her life after a shark attack at a beach in eastern Sydney. Emergency services were called to the scene and provided immediate medical assistance. The victim sustained critical injuries and has been transported to a local hospital. Authorities have closed nearby beaches as a safety precaution while investigations are underway. The species of shark involved is currently unknown. This incident marks a rare but serious shark encounter in the typically safe swimming waters of Sydney. Further updates will be provided as they become available.